I have a 2000 gmc sierra extended cab pickup, 1500 series ,2 wheel drive, 4.8 litre engine with automatic transmission.

hi

the coolant could have got into the engine from the intake gaskets..these are known to have a leaking intake manifold gasket......it is sometimes common to maybe have a little milk look in the oil in cold weather from condensation...

thanks

sorry

for some reason i was thinking 5.7,,i got confused with another guy i was talking to

anyways,,yes,it is very possible for it to have been a bad head gasket...i wouldn't think you are loosing much coolant..just a little may not show up in the pan,but accumulate in the valve cover....look around the water pump on this engine,the coolant may be steaming off from the water pump and what you see in the covers is just condensation

thanks

Intake Manifold Removal

Important: The intake manifold, throttle body, fuel injection rail, and fuel injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly. DO NOT reuse the intake manifold-to-cylinder head gaskets.   Remove the Positive Crankcase Ventilation (PCV) hose (1) and valve (2).     Remove the Manifold Absolute Pressure (MAP) sensor (1) (if required). Remove the engine coolant air bleed clamp and hose from the throttle body.     Remove the accelerator control cable bracket (2) and bolts (1) (if required).     Remove the Evaporative Emission (EVAP) solenoid (3), bolt (2), and isolator (1).     Remove the intake manifold bolts. Remove the intake manifold with gaskets.     Separate the intake manifold-to-cylinder head gaskets (1) from the manifold. Discard the intake manifold gaskets.

ok

it is possible for it to have been blown in the water jacket and cylinder..this would send most the coolant out the exhaust,and some into the oil...the oil in the valve cover is not separated from the pan.....

thanks